Final answer:
The main and secondary reinforcement for the critical section of the simply supported one-way concrete slab bridge can be determined using design guidelines provided by the ACI 318-14 design code.
Step-by-step explanation:
The main and secondary reinforcement for the critical section of the simply supported one-way concrete slab bridge can be determined using the design guidelines provided by the relevant design code, such as the American Concrete Institute (ACI) or British Standards (BS). In this case, we can use the ACI 318-14 design code to calculate the reinforcement.
First, we need to determine the maximum bending moment at the critical section. The maximum bending moment occurs at the supports, and its value can be calculated using the equation:
Mmax = wL^2/8
where w is the uniform load on the slab, which is the sum of the truck load and the asphalt load, and L is the span length in meters.
Once we have the maximum bending moment, we can calculate the required area of main reinforcement using the equation:
As = (Mmax * 10^6) / (0.87 * fyd * d)
where Mmax is the maximum bending moment, fyd is the yield strength of the reinforcement (usually 415 MPa for high-strength reinforcement), and d is the effective depth of the slab. Similarly, the area of secondary reinforcement can be calculated using the equation:
As' = (As * s) / c
where s is the spacing of the main reinforcement bars, and c is the spacing of the secondary reinforcement bars. It is important to note that these calculations are simplified and should be verified and refined by a professional engineer.